No One Is Prepared for Hagfish Slime
It expands by 10,000 times in a fraction of a second, it's 100,000 times softer than Jell-O, and it fends off sharks and Priuses alike. At first glance, the hagfish-a sinuous, tubular animal with pink-grey skin and a paddle-shaped tail-looks very much like an eel.
https://www.theatlantic.com/science/archive/2019/01/hagfish-slime/581002/
